Another tip. Get your toss consistent and focus on the racquet drop by using an abreviated serve.

to the op....look at my older posts and find the one called "serve...advice wanted"...or something close to that and read through that thread. LOTS AND LOTS of great advice for me there that I'm sure will help you as well.

But the easiest and quickest ways to improve your serve without getting to technical are:

1) get a consistent toss that is 1-2 feet into the court and to a point where you will contact the ball with maximum arm extension.

2) learn to serve with a LOOSE arm and wrist....almost to where you feel "out of control" as to where the ball will go. Once you dial in that proper degree of "loose-ness", you will be amazed at how much better your serve becomes.

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to see what I'm up to lately:
http://tt.tennis-warehouse.com/showthread.php?t=499860